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Exothermic and endothermic reactions key terms
Study Exothermic and endothermic reactions with curriculum-aligned Key Terms resources, practice links, and exam-focused support.
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key terms
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Exothermic and endothermic reactions
Key terms
Bond energy
The energy required to break one mole of a specific bond in a molecule. In The energy change of reactions (HT only), this term is used specifically to support the learning objective: (HT only) Calculate the total energy needed to break bonds in reactants from supplied bond energies. (MS 1a).
Exothermic reaction
A reaction that transfers energy to the surroundings, resulting in an increase in temperature.
bond energy
The average energy required to break one mole of a specific type of bond in a molecule. In The energy change of reactions (HT only), this term is used specifically to support the learning objective: (HT only) Calculate the total energy released when bonds form in products from supplied bond energies. (MS 1a).
energy released
The energy that is emitted when bonds are formed in the products of a chemical reaction.
overall energy change
The difference between the energy needed to break bonds in reactants and the energy released when bonds form in products.
bond energy
The amount of energy required to break one mole of a specific bond in a molecule. In The energy change of reactions (HT only), this term is used specifically to support the learning objective: (HT only) Calculate the overall energy change as energy needed to break bonds minus energy released when bonds form.
exothermic reaction
A reaction that transfers energy to the surroundings, resulting in an increase in the temperature of the surroundings.
bond energy
The energy required to break one mole of a specific bond in a molecule, which can be used to determine whether a reaction is exothermic or endothermic.
Endothermic reaction
A reaction that takes in energy from the surroundings, resulting in a decrease in temperature.
Bond energy
The energy required to break one mole of bonds in a substance, which influences whether a reaction is endothermic or exothermic.
bond energy
The average energy required to break one mole of a specific type of bond in a molecule. In The energy change of reactions (HT only), this term is used specifically to support the learning objective: (HT only) Use supplied bond energy data to calculate the energy transferred in a chemical reaction.
energy transfer
The movement of energy from one system to another, often observed as heat in chemical reactions.
energy transfer
The movement of energy from one system to another, which can be measured in chemical reactions.
enthalpy change
The heat content change of a system at constant pressure, often represented as ΔH in chemical reactions.
Bond energy calculation
A quantitative method that uses the energies required to break bonds in reactants and the energies released when bonds form in products to determine the overall energy change of a reaction.
Reaction profile interpretation
A qualitative analysis of a plotted energy diagram that identifies whether a reaction is exothermic or endothermic by comparing the relative energies of reactants, products, and the activation energy.
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